Cho mình hỏi cho tứ diện đều ABCD cạnh . Gọi IJ lần lượt là trung điểm của AB và CD
a) tính cos góc giữa AB và (BCD) 
b) tính sin góc giữa IJ và (ACD)
c) tính cos góc giữa (ABC) và (BCD)
Mình cảm ơn nhiều ạ !!!

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